Air Plan Approval; Indiana; Abengoa Bioenergy of Indiana, Commissioner's Order

The Environmental Protection Agency (EPA) is approving a revision to the Indiana State Implementation Plan (SIP) submitted by the Indiana Department of Environmental Management (IDEM) on October 16, 2015. The submittal consists of an order issued by the Commissioner of IDEM (Commissioner's Order No. 2015-01) approving alternative control technology requirements for Abengoa Bioenergy of Indiana (Abengoa). These requirements include the use of a carbon adsorption/ absorption hydrocarbon vapor recovery system with a minimum overall control efficiency of 98% to control volatile organic compound (VOC) emissions from the ethanol loading racks at Abengoa. A continuous emissions monitoring system (CEMS) must be used to monitor the carbon adsorption/absorption hydrocarbon vapor recovery system for breakthrough of VOC emissions. For the reasons discussed below, EPA is approving this submittal as a revision to Indiana's SIP.